CN101238326B - surgical light - Google Patents

Abstract

The invention relates to a surgical light comprising at least one light source arranged in the light body and an optical part designed to direct the visible light emission of the light source onto the surgical field. According to the invention, said lamp comprises several light emitting diodes as light sources.

Description

surgical light

technical field

The invention relates to a surgical light comprising at least one light source arranged in a light body and optics for guiding the visible light of the light source to the surgical field.

Background technique

Surgical lamps of this type are known which use a halogen lamp or a discharge tube as the light source and a reflector as the optics.

Contents of the invention

The object of the present invention is to provide a surgical light that is multifunctional in use and has a structural shape that facilitates its use in an operating room.

This object is achieved by the features of claim 1 .

According to the invention, the light source of the surgical light has a plurality of light-emitting diodes, which results in a completely new solution for lighting the surgical field. Due to the use of light-emitting diodes as light sources, it is possible to form the operating lamp in a shallower structural shape, which is advantageous in terms of aesthetics and technical flow, because in this case the Airflow from the supply air ceiling is unimpeded. At the same time, due to the good dimmability of light-emitting diodes, and due to their optical properties, there are a variety of other application options that can be incorporated into surgical lights.

Advantageous embodiments of the invention are described in the description, the drawings and the dependent claims.

It is therefore advantageous to arrange the light-emitting diodes in the lamp body in a ring shape, in particular in a circular shape. This aspect makes it possible to place an accessory or an additional light source at the center of the ring. On the other hand, the lamp body can be designed in such a way that air can circulate inside the lamp body, ie inside the ring, through the housing ring formed therefrom. The surgical light thus presents fewer obstacles to the process flow and the flow path of the laminar flow is less obstructed when the air supply ceiling is used to keep particles and bacteria optimally away from the surgical field.

In such cases, it is also advantageous to make the lamp body or the housing ring relatively shallow, thereby forming a disc-shaped lamp body which is integral but open inside.

According to a further advantageous embodiment, the lamp body has a central mounting for accessories, in particular for additional light sources. For example, a dedicated spotlight, cold light source or camera could be placed in this central mount, or other tools for the surgical team could be located therein. An additional light source in the center can be used for depth lighting and for direct target lighting. In this regard, it is advantageous to arrange a gas discharge lamp or a halogen lamp which can be switched individually, ie independently of the light-emitting diodes, in the center of the lamp body. This allows, for example, direct access to depth lighting when required by the surgeon.

According to yet another advantageous embodiment, a plurality of optical modules are provided, each comprising at least one light emitting diode and an associated reflector and/or collimator as optical means. Such optical modules can be manufactured as very small units, for example as cost-effective injection molded parts. The collimator produces substantially parallel rays, and illumination angles of the order of 4° are possible. Since the light emitted by the light-emitting diodes is already collimated at the light source, this enables efficient coupling of the emitted light into the beam path. In addition, plastic collimators, for example made of high-refractive plastic, can be provided, which achieve a further bundling of the light beam and thus achieve the desired small irradiation angles by way of total reflection.

It is particularly advantageous if the optical module is arranged to be movable, for example pivotable, since in this case the size of the light field can be changed by pivoting the optical module. Focusing can also be achieved by moving the optical module relative to a reflector or collimator fixed to the housing. Each light-emitting diode can thus have an associated focusing optics, wherein focusing can be achieved, for example, by adjusting the relative distance between the light-emitting diodes and the focusing optics. It is particularly advantageous if all focusing optics of the operating light can be adjusted together, for example pivoted together, by means of the adjusting element. Likewise, the optical modules of the operating light can be adjusted together, in particular pivoted together, by means of such an adjusting element (for example an adjusting ring).

According to a further advantageous embodiment, an annular reflector is provided, which is for example arranged at the lower part of the lamp body or integrated into the lamp body at the lower part of the lamp body. With such a circular reflector, the diameter of the lamp housing is fully utilized and the maximum divergence angle of the incident is obtained, so that ideal clear shadows are produced. On the other hand, it is of course also possible for the light-emitting diodes to impinge directly into the operating field in a converging and diverging manner.

According to yet another advantageous embodiment of the present invention, the optical device enables the emission of converging light rays and the emission of divergent light rays. For example, two reflectors can be provided, one of which implements converging rays and the other implements diverging rays. Optionally, different converging and diverging reflector sections may also be provided in the reflector. It is also possible to arrange converging and diverging optics modules in the surgical light so that both converging light and diverging optics are produced, which is advantageous for shadowless illumination of the operating area.

According to a further advantageous embodiment of the invention, the optical modules are produced in such a way that each optical module fully illuminates the light field within a predetermined light field diameter. In other words, the light field within the predetermined light field diameter is not illuminated by different optical modules in different parts, but each optical module provides a complete and uniform light field illumination within the predetermined light field diameter to ensure as large as possible unshaded area.

According to yet another advantageous embodiment, a fan may be provided for cooling the light source within the closed housing in which the light source is located, thereby creating a forced flow within the closed housing which takes heat away from said light source. In this way, on the one hand heat is removed from the light source (for example light emitting diodes provided with cooling fins). At the same time, however, the closure of the housing ensures that the flow over the operating field is not adversely disrupted.

According to yet another advantageous embodiment of the invention, liquid cooling may be provided for cooling the light source. In this way, the heat generated by the light source (which is necessary for the problem-free operation of the light-emitting diodes) can be removed in an efficient manner. In this case, cooling of the light source is preferably performed using cooling water.

According to a further aspect of the present invention, the operating light has at least one illuminant, for example one or more of the already mentioned light-emitting diodes with a control device, the maximum intensity of which is in the range of about 450 nm, by means of which control device can This additional illuminant is controlled independently of the light source, for example independently of other light emitting diodes. In this embodiment, the effect that the light also has a physiological effect on the observer is utilized. The second part of the optic tract is triggered by specific wavelengths of light within the blue spectrum that act as energy components to trigger coordinated activity of the metabolic and endocrine glands. Daylight is known to suppress the release of a hormone (melatonin), which has a circulatory effect because melatonin regulates the day/night rhythm (circadian rhythm). The secretion of melatonin at night is affected by blue light through photoreceptors in the human eye that are evenly distributed on the retina and cannot distinguish image patterns. Because the surgical team is often working under very high stress and often many hours at night, it is possible to support the work of the surgeon by choosing the spectrum appropriately so that he can also work in difficult emergencies at night. Work with maximum concentration during surgery. The suppression of melatonin secretion can be facilitated by additional illuminants with a maximum intensity in the range of about 450nm, thus increasing the effectiveness of the surgical team even if they are operating at night or for several hours during the day.

It is particularly advantageous if the additional illuminant can be switched in automatically by the control device according to certain parameters. Such a parameter can be, for example, the current time (time of day) or the current operating duration of the light source, from which the elapsed operating time can be determined. For example, when the current time advances, that is, when the evening is about to enter, the illumination of the illuminating body can be increased. Boosting can also be done when the light source has been kept on, ie for example when it has been running for several hours. This prevents fatigue on the one hand and even achieves an increase in performance on the other hand.

As already mentioned above, the illuminant for suppressing melatonin can also be used as an additional illuminant. However, it is also possible to control the color spectrum of the surgical light so that it illuminates with increasing or continuously increasing intensity in the desired wavelength range of approximately 450 nm. Furthermore, the illuminant for suppressing melatonin does not have to illuminate in the direction of the surgical field. Instead, the radiation can also be emitted towards the side or towards the top, ie indirectly. Furthermore, the lighting body can also be arranged in a separate lamp body.

According to a further aspect of the invention, the operating light has a control device, which is provided with an input device, by means of which a reference wavelength or a reference wavelength range can be selected, whereby the light-emitting diodes of the operating light can be controlled (and can Optionally also further light-emitting diodes) so that the radiation directed from the operating light to the operating field is emitted predominantly or only at the reference wavelength or in the reference wavelength range. In this exemplary embodiment, besides the possible illumination of the operating field, the surgical light according to the invention additionally has diagnostic light (reference light) for simple and reliable localization of tumors and different tissues, for example. It must be mentioned at this point that the reference light or the diagnostic light does not necessarily have to be in the visible spectrum.

Since light penetrates to different depths in human tissue, direct illumination by narrowband light and, optionally, simple distinction between different tissues can be made by means of contrast-enhancing measures. One such possible diagnosis is fluorescence diagnosis, which is based on the selective accumulation in tumor cells of specific stains, which become visible after excitation with light of a specific wavelength.

In fluorescence diagnosis, body tissue is directly illuminated by lower intensity blue light (reference light), for example, and its diffusely scattered part is detected together with the generated fluorescence. Therefore, the intensity of the blue light is set to make normal tissue appear blue. However, the enhanced red fluorescence of previously used active agents such as 5-aminolevulinic acid shifted the color towards red. Malignant or pathological cells can be identified by viewing the surgical field with an optical filter that filters blue light irradiation (e.g., with the aid of an eye mask or an electronic camera that electronically affects the filter), because the active agent accumulates in these cells more than in healthy cells get more.

Inflamed tissue produces structures that are much darker than surrounding healthy tissue due to altered absorption and reflection behavior, so additional diagnostics are possible by using irradiation at reference wavelengths. Spectrally narrow bands of light can be used to form a definitive diagnosis, which is only possible with conventional light sources with the aid of strong filtering. Since colored LEDs produce quasi-monochromatic light with a bandwidth of +/- 20nm and almost 100% pure color, LEDs are particularly suitable for diagnostic light. In this regard, it is particularly advantageous if the aforementioned control device has switching means for switching between an operating mode using reference irradiation and an operating mode using daylight-like irradiation, because in this way it is possible to use conventional surgical operations and diagnostic Extremely fast transitions between operations.

According to a further advantageous embodiment, the control device has switching means with which switching between a reference illumination in the infrared spectrum and a reference illumination in the ultraviolet spectrum is possible. Such a surgical light can be used for different diagnostic applications, since it can be quickly and reliably switched between different applications in the infrared and ultraviolet spectra in a simple manner.

In order to visualize the fluorescence spectrum, it is advantageous to have an electronic camera built into the surgical light, whose evaluation electronics achieve the desired filtering.

Description of drawings

The invention will be described below with reference to an advantageous embodiment and to the drawings. In the attached picture:

Fig. 1 is a partially cutaway side view of a working light;

Figure 2 is a side view, partially cut away, of yet another embodiment of a surgical light; and

Fig. 3 is a plan view of the control device.

Detailed ways

The surgical light shown in FIG. 1 has a lamp body 10 formed in a ring shape and surrounded at its outer periphery by a fence 12 fixed to the outside of the lamp body 10 by a support member 14 . Thus, the lamp body 10 is formed as a housing ring, which in the illustrated embodiment is formed in the form of a ring, and air can circulate through its ring-shaped interior, which is indicated by the vertical arrows in FIG. 1 . Due to the low height of the outer shell ring, the lamp body 10 is formed into a disk-shaped structure as a whole.

The light source is arranged inside the lamp body 10 in the form of a plurality of light emitting diodes 16 which illuminate the operating field 22 via the collimator 18 and the ring reflector 20 . The light emitting diodes 16 are respectively arranged in the lamp body 10 in a ring shape or in a ring shape.

Arranged inside the housing ring 11 is a central mounting 24 which is formed in the form of a beaker and which has an additional light source 26 in the form of a discharge lamp inside it. The light from the discharge lamp 26 is directed vertically downwards via a parabolic reflector 28 in the interior of the central mount 24 for deep illumination of the surgical field.

A transparent end plate 30 is disposed on the lower side of the central mount 24, and a handle 32 is arranged at the center of the transparent end plate, and a CCD camera 34 is integrated in the handle 32. A detachable outer seat cover 25 is provided on the upper side of the central mounting seat 24 . The surgical light itself is secured to the support table by joint arms not shown. The housing ring 11 is connected via three radially extending supports 23 to a central mounting seat 24 which in turn is connected to a not shown engagement arm.

As can be seen from FIG. 1 , in this embodiment the light emitting diodes 16 and associated collimators 18 are incorporated into an optical module 19 which is shown in dashed lines and which can be in the direction of the double arrow shown. pivot. All optical modules 19 are pivotable together by means of an adjustment ring 21 extending in the peripheral direction inside the housing ring 11 and provided with helical toothing for corresponding pivoting of the optical modules with corresponding toothing. An electrically drivable servo motor is provided for driving the adjustment ring 21 .

As shown in FIG. 1 , the reflector 20 is formed in a ring shape, and is fixed to the lower side of the housing ring 11 so that it hermetically closes off the inside of the housing ring. The reflector 20 is made of high-refractive plastic, and reflects incident light with total reflection at its outer surface. The optical module 19 can be pivoted by driving the adjustment ring 21 , thereby changing the diameter of the light spot formed on the surgical field 22 .

FIG. 2 shows another embodiment of a surgical light, wherein the same components are denoted by the same reference numerals.

In the surgical light shown in FIG. 2 , the light body has a first housing ring 11 which is produced in the same way as in the embodiment of FIG. 1 . In addition, a second housing ring 11' is provided, the diameter of which is smaller than that of the first housing ring 11, both of which are arranged concentrically to each other and are fixed to the support body 23. Light emitting diodes 16 and 16' are then arranged inside said two housing rings 11, and respective collimators 18, 18' are arranged behind each of them. The undersides of the two housing rings 11 and 11' are closed by annular reflectors 20, 20' of highly refractive plastic, respectively.

However, the two reflectors 20 and 20' have different designs (curvatures) of the peripheral surfaces that totally reflect the incident light. Thus, the outer annular reflector 20 emits converging rays, while the inner annular reflector 20' achieves diverging rays.

The corresponding collimators 18 and 18' can then be adjusted via the adjusting rings 21, 21', but in this embodiment no pivoting movement takes place, but instead the LEDs and the collimators are adjusted along the optical axis, ie along the The spacing between the directions of the double arrows shown. Thus in this embodiment the LEDs 16, 16' are not connected to the collimator 18, 18' to form a unit. In contrast, the collimators 18, 18' are structurally separate optical modules that are movable independently of the LEDs 16.

Light-emitting diodes are particularly advantageous in which the light emitted by the chip is already collimated at the light source, since an efficient coupling of the emitted light into the light path can thus be achieved. In addition, a plastic collimator can then be connected, which enables a further bundling of the light rays and thus forms an angle of radiation of the order of 4° which is as small as possible with the aid of full emission. Lens components or reflector components may also be incorporated in the chip or within the optical module. Furthermore, high-performance LEDs with integrated heat sinks are particularly suitable.

In order to obtain as variable a color mixture as possible, red, yellow and blue light-emitting diodes can be used, for example, the resulting color can be adjusted directly via the color sensor.

The controller 40 shown in Fig. 3 includes a power supply (24V) and a USB/DMX interface for connecting the control unit. The different groups of LEDs are controlled by variable operating voltages via the color control interface to obtain the desired color mix. In addition, the use of white light-emitting diodes is also feasible.

All colors of the visible spectrum and white operating room light with different color temperatures can be produced using the color changing system described above. Amber and white LEDs are preferably used to control different color temperatures, eg 3000 to 6000K.

The controller 40 shown in FIG. 3 has an input area divided into three sections, the left hand section being provided for controlling common operating room lights. Since the adjustment rings 21, 21' are driven by a servo motor not shown, the light field diameter can be changed with the aid of the adjuster 41. The brightness can be varied by means of a regulator 42 .

The operator panel part of the controller 40 in the middle of Fig. 3 is used to switch in light with increased intensity in the wavelength range around 450 nm, which can be done by directly controlling the LEDs 16, 16' or additional LEDs. In this regard, the controller is configured such that conventional operating theater lights remain unchanged even when the LEDs required for 450 nm illumination are illuminated at increased intensities. The button 43 can be used to permanently switch to luminescence in the range of 450 nm (hereinafter referred to as stimulated light). Alternatively, an automatic operation can be started by means of the button 44 , in which the activated light is automatically switched in with the aid of a pre-set program independently of the current time of day and the current operating duration of the operating light. This way, the stimulated luminescence continues to increase as the operating light increases during the procedure and as the time of day progresses further. For this purpose, the controller 40 has a built-in clock and a time measuring unit which is activated when the operating light is switched on so that the duration of the operation can be determined.

The control panel area of the controller 40 at the right in FIG. 3 has a display 45 and various input devices 46 via which a reference wavelength or a reference wavelength range can be selected. In the illustration of FIG. 3 , a reference wavelength of 480 nm is selected, which has the result that after the release of the reference light by actuation of the button 47, the gas discharge lamp 26 is switched off and all light-emitting diodes 16, 16' are controlled. The luminescence directed from the surgical light to the surgical field 22 is configured to output predominantly or entirely at a selected reference wavelength or range of selected reference wavelengths. This makes it easy to set the ideal diagnostic light. Multiple actuation of button 47 switches between operation with diagnostic light and operation with conventional operating room light. The gas discharge lamp 26 can be switched on and off individually via a further button 48 .

A camera 34 built into the surgical light handle 32 is connected to a controller 40 within which is located a filter system that filters the generated reference illumination so that only the generated fluorescence spectrum is reproduced on a monitor (not shown). )superior.

Claims (22)

1. A surgical light having at least one light source arranged in a lamp body (10) and optical means (18, 18'; 20, 20'), characterized in that the light source has a plurality of light emitting diodes (16, 16'), A control device (40) is provided which has an input device (46) via which a diagnostic wavelength or a diagnostic wavelength range can be selected, whereby the light-emitting diodes (16, 16') and optionally the Other illuminants (26) of the operating light can be controlled by the control device (40), so that the irradiation directed from the operating light to the operating area (22) is mainly or entirely at the diagnostic wavelength or within the diagnostic wavelength range output. 2. The operating light according to claim 1, characterized in that, the light emitting diodes (16, 16') are arranged in the lamp body (10) in a circular shape. 3. Surgical light according to claim 1, characterized in that the light body (10) has at least one housing ring (11, 11'), the annular interior of which can flow through and the light-emitting diodes (16, 16 ') are arranged in it. 4. The operating light according to claim 1, characterized in that, the lamp body (10) is made into a disc shape. 5. The operating light according to claim 1, characterized in that the light body (10) has a central mounting seat (24) for accessories. 6. The operating light according to claim 1, characterized in that a gas discharge lamp (26) or a halogen lamp is arranged in particular at the center of the lamp body (10) and is in particular individually switchable. 7. Surgical light according to claim 1, characterized in that a plurality of optical modules (18, 18', 19) are provided, which are in particular movably arranged and comprise as said optical device reflectors and/or collimators (18, 18'). 8. Surgical light according to claim 7, characterized in that the distance between the light-emitting diodes (16) and the associated optical module (18, 18') can be varied by means of an adjustment device. 9. Surgical light according to claim 7 or 8, characterized in that a light emitting diode (16) is integrated into each optical module (19). 10. Surgical light according to claim 7 or 8, characterized in that a plurality of optical modules (18, 18', 19) can be adjusted together by adjusting means. 11. Surgical light according to claim 1, characterized in that each light-emitting diode (16) has as said optical device an associated focusing optics, which can be adjusted together, in particular pivoted, by means of an adjustment element (21) All of the focusing optics. 12. The operating light according to claim 1, characterized in that an annular reflector (20, 20') is arranged at the underside of the lamp body (10), or at the lamp body ( 10) is integrated into said lamp body (10) at its lower side. 13. Surgical light according to claim 12, characterized in that the reflector (20, 20') is made of plastic and that the introduced radiation is reflected in total reflection. 14. Surgical light according to claim 1, characterized in that the maximum intensity of at least one of said light-emitting diodes (16) is in the range of about 450 nm; A light source controls said light emitting diodes (16). 15. The operating light according to claim 14, characterized in that the light-emitting diodes (16, 16') can be automatically switched on by the control device (40) with reference to at least one parameter, and the at least one parameter is selected from the following Groups: current time, current operating light duration. 16. The operating light according to claim 15, characterized in that the luminous flux of the light emitting diodes (16, 16') can be changed automatically by the control device (40) according to the current operating duration of the operating light . 17. The operating light according to claim 1, characterized in that the control device (40) has a switching device (47) for switching between an operating mode using diagnostic irradiation and an operating mode using daylight-like irradiation. convert. 18. Surgical light according to claim 1, characterized in that the control device (40) has a switching device for switching between diagnostic radiation in the infrared spectrum and diagnostic radiation in the ultraviolet spectrum. 19. Surgical light according to claim 1, characterized in that it has an electronic camera system (34, 40) which is provided for recording fluorescence spectra. 20. Surgical light according to claim 1, characterized in that said optics (18, 18'; 20, 20') generate both converging and diverging rays. 21. The operating light according to claim 1, characterized in that a fan is provided for cooling the light source inside the closed housing (11, 11'). 22. The surgical light of claim 1, wherein liquid cooling is provided for cooling the light source.

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